Adapter 6-Pole Round to 4-Flat with Cover

Adapter 6-Pole Round to 4-Flat with Cover

Item # 47305B

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47305B - 4 Flat Hopkins Wiring
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Lowest Prices for the best wiring from Hopkins. Adapter 6-Pole Round to 4-Flat with Cover part number 47305B can be ordered online at or call 800-298-8924 for expert service.
  • All Info
  • Reviews (14)
  • Q & A (14)
  • Videos (2)
  • Photos
  • Why etrailer?

Hopkins Wiring - 47305B

  • Wiring Adapters
  • Single-Function Adapter
  • 4 Flat
  • 6 Round
  • Hopkins


  • Adapts 6-pole round adapter on your vehicle to 4-pole flat
  • Includes 4-pole cover

Replaces 47309 and 37308

47305 Hopkins Adapter 6 Pole Round to 4 Flat

California residents: click here

Video of Adapter 6-Pole Round to 4-Flat with Cover

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Trailer Wiring Harness Installation - 2013 Jeep Wrangler

Today on our 2013 Jeep Wrangler, we'll be installing the Hopkins 6-Round to4-Flat Adapter, part number 47305B. To install it, we'll simply open up the 6-pull round connector, then slide the 6-pull round end into the connector firmly, making sure it goes all the way into the connector, then the flap, or door, will help hold and lock the adapter in place. Then we can remove the four-way cap, and go ahead and install our 4-way flat connector. Now we're ready to hit the road, and that does it for the install of the Hopkins 6-Round to 4-Flat Adapter, part number 47305B, on our 2013 Jeep Wrangler. .

Customer Reviews

Adapter 6-Pole Round to 4-Flat with Cover - 47305B

Average Customer Rating:  4.9 out of 5 stars   (14 Customer Reviews)

- 47305B

One year later, and it is still performing wonderfully! For whatever reason, the shape of it prevents my standard socket lid from locking down 100%, but it fits very snuggly and I wouldn't be concerned unless is driving across the country with it. 441285


One year later, still working great! Ive only had to use it a few times, but the material has held up, stored mostly in a bag.

Joseph - 10/12/2018


- 47305B

The product was exactly what I ordered but Unfortunately I requested an six pin round adapter to a four pin flat when I should have requested a converter because my RV has separate brake and turn lights and my tow lights are single turn/brake lights. 705020

- 47305B

Great product for the price, easy to install. As always with ETrailer quick service and great to deal with thanks again! 607484

- 47305B

As expected, this item was top shelf. The Price was terrific, can't say more. 553263

- 47305B

Another great Hopkins product. I always look for Hopkins items when I have a need for trailer lighting or wiring repairs or replacements...Top Shelf. reasonably priced and durable. Thanks etrailer 503257

- 47305B

Looks like it is going to work great. 446788

- 47305B

I am pleased with the two items that I ordered. Instead of having to change out my outdated plug, I was able to find adapters for my various trailers instead. 309434

- 47305B

Working Well 277644

- 47305B

Great Product 252898

- 47305B

It's the one I wanted and it works. 237026

- 47305B

Very pleased I ordered an adapter for my trailer lights I couldn't find one locally but found exactly what I needed on and was delivered in two days will make additional orders in the future if needed 213745

- 47305B

Great product and wonderful service thanks Charlie 149703

- 47305B

As simple as this adapter is what's to say it is good quality and it works 111351

- 47305B

Just what I needed and the product arrived very fast. I looked several other places for this adaptor and was the only place with it and I'm very pleased. 15063


Ask the Experts about this Hopkins Wiring

Do you have a question about this Wiring?

  • Towing a Trailer with a 6-Pole Trailer Connector with a Vehicle That has a 4-Way Connector
  • Actually you need part # 37175. It plugs into your vehicle's existing 4-way and gives you a 6-way round. There are 3 extra wires; blue for trailer brakes, red for an auxiliary (usually 12 volt power), and a white for ground. The white wire needs to be grounded to the vehicle's frame from the connector to function. The other two can be capped off if you're not going to be use them. If you do need the other two wires the blue is run to the vehicle's cab and connected to the blue wire...
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  • How Does 6-Way to 4-Way Adapter Work
  • The 6-Way is not wired as you think. One is for ground, one is for tail light, one is for R turn/brake, one is for left turn/Brake, one is for trailer brakes, and the last is for either reverse lights or 12V power. The last wire may be omitted if not needed. A 4-Way has the following wires: White - ground, brown - tail light, green - right brake/turn and yellow - left brake turn. Turn signals, in essence over ride the brake signal since they are the same bulb or filament. Because...
    view full answer...

  • Adapting a 6-Way Round Trailer Connector to a 4-Way Flat on a Winnebago
  • To adapt a 6-Way round trailer connector to a 4-Way flat, you will just need an adapter like # 47305B that you have referenced. The turn signals and brake lights on the Winnebago do not matter because the signals at the trailer connector are already converted to have the brake lights and turn signals on combined circuits which is what trailers use.
    view full answer...

  • 6-Way to 4-Way Adapter Recommendation for RV Flat Towing Vehicle
  • To adapt a 6-Way round trailer connector to a 4-Way flat, you will just need an adapter like # 47305B that you have referenced. The turn signals and brake lights on the Winnebago do not matter because the signals at the trailer connector are already converted to have the brake lights and turn signals on combined circuits which is what trailers use. If for some reason you had separate trailer wiring on the RV you would need to make an adapter. You would need an adapter # RM-732 and a...
    view full answer...

  • No Brake Light Function on 6-Way Round Trailer Connector on Chevy Motor Home
  • It sounds like there is a blown stop light fuse on the Chevy motor home. Use the owners manual or the legends on the power distribution box lid/in-cab fuse panel to locate any and all tow package wiring fuses so you can check them. If that is not the problem it is possible that the 6-Way on the motor home has separate brake light and turn signal circuits. You would need to test the other pins to determine if any of them carry a brake light signal. If there are separate circuits for...
    view full answer...

  • Adapter for a 6-Way Round on a Harley Davidson Trike to a 4-Way Flat Trailer
  • It does not appear that any of the 6-Way to 4-Way adapters are going to work because of the unique pin out that is on the 6-Way on your 2013 Harley trike. You would essentially need to make an adapter to match the pin out. You will need a trailer side 6-Way, # PK11604, and a vehicle side 4-Way, # 18172, cut to the length you need. Then you just attach the wires in the right place to match the 6-Way you have. On the 4-Way end the white wire is ground, yellow is left turn and stop, green...
    view full answer...

  • Trailer Wiring Harness Recommendation for a 2004 Pontiac Montana
  • Actually, all you will need to do is install a wiring harness, # 118355, on your 2004 Pontiac Montana. But if you wanted to use those factory wires, because you have separate wires for turn signals and brake lights, you would first need to install a converter. The converter, # RM-732, takes the separate signals and combines them which is what a trailer uses. To wire it up your yellow wire will go to the yellow wire on the converter, green will go to green, white will go to white, and...
    view full answer...

  • 6-Way Round to 4-Way Flat Adapter Recommendation for a Camper
  • If you are looking for a way to convert the round 6-way on your camper to a 4-way you would need a product like the Adapter 6-Pole Round to 4-Flat # 47305B. The 6-way male end of this adapter will plug into the 6-way on your camper and will provide a 4-way connection on the opposite side of the connector. The Wiring Harness part # 118391 that you referenced would not work for you as it is a wiring harness designed for Chevy Equinoxes.
    view full answer...

  • How to Connect an RV with a 6-Way Trailer Connector to a Flat Towed Vehicle with a 4-Way Connector
  • To connect your RV to your flat towed vehicle you will need a 6-way to 4-way adapter on the RV, like part # 47305B. Then to connect from the adapter to the front of your towed vehicle you can use the Roadmaster Extension Loop for Towed Vehicles # RM-300150-00. This has a 4-way vehicle side connector on each end.
    view full answer...

  • Troubleshooting Trailer Wiring Connection for Lack of Brake Lights
  • The Hopkins Endurance Flex Trailer Connector Adapter w/ LED Circuit Tester - 6-Pole to 4-Pole # HM47320 and the other adapter you used most likely are not the issue. I recommend testing your 6-way connector with a circuit tester like # PTW2993 to ensure you have both brake and turn signal function on each of the lower pins. If you have both the right turn and stop and the left turn and stop, then we know your vehicle connection is good. Since we know your trailer works with other...
    view full answer...

  • Adapting Motorcycle with 4-Pole to Trailer with 6-Way Connector
  • You will need a converter/adapter when connecting different wired vehicles. Depending on how your vehicle and trailer are wired we have three 4 to 6 wire adapters. Adapter 4 Pole to 6 Pole # 30637 Adapter 4 Pole to 6 Pole and 4 Pole Trailer Wiring Adapter # 37175 If your trailer has brakes you will need a brake controller and for a motorcycle you will need a model that has time delay functionality. I would recommend the Activator IV by Draw-Tite, part # 5504. This will work with...
    view full answer...

  • Ball Mount and Trailer Connector Adapter Recommendation for 2014 Mercedes GLK 350
  • It is important to choose a ball mount with the correct rise or drop needed so you can tow your trailer level. You will want to measure your hitch height, as well as the height of your trailer's coupler. The difference between these two heights will let you know which drop or rise you will want. I have attached a help article on finding the correct ball mount. You will also want to know the weight of the trailer you are towing. This is important to make sure you do not exceed the towing...
    view full answer...

  • Adapting Different Connectors on 2014 Mercedes GLK250 and Prolite Suite Trailer
  • Vehicle and trailer connectors come in several varieties, including both 6-way round and 7-way blade types. The linked article on trailer wiring illustrates both, as well as other types. These two types are NOT compatible with each other. Within each type of connector sizes are usually standardized, although the actual wire configuration (what particular signal is carried by any given pin/wire) can vary by brand. My associates and I have not heard of this issue before but certainly...
    view full answer...

  • Trailer Connector Adapter for a 1994 Ford F-250 to Tow a Boat Trailer with a 4-Way Connector
  • The easiest way to tow your boat that has a 4-way trailer connector using your 1994 Ford F-250 with a 6-way connector is to use an adapter like # 47305B. If you have the more common 7-way blade connector on your truck you can use # 47345. Either simply plug into the truck's connector then you connect the trailer's 4-way. Since they're small they can easily be stored when not in use. The best part is whichever one you need will make you legal.
    view full answer...

Do you have a question about this Wiring?

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Info for this part was:

Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Video Edited:
Joshua S
Test Fit:
Nicholas E
Installed by:
Cole B
Updated by:
Sarah W
Updated by:
Alexander C

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